Configuration of a unique antibacterial needle-punched nonwoven fabric from silver impregnated polyester nanocomposite fibres
Rahul R. Gadkari, S. Wazed Ali, Apurba Das, R. Alagirusamy
Abstract
The current study aims to mitigate the problems arising due to leach-out of silver nanoparticles (Ag-NPs) from an antibacterial material developed using silver coating or finishes. Polyester (PET) staple fibres with Ag-NPs firmly integrated within them were used to prepare needle-punched nonwoven fabric. To further enhance the antibacterial efficiency, the nonwoven surface was etched via alkaline hydrolysis such that the Ag-NPs are exposed to the bacterial cell wall. The antibacterial activity of the nonwoven made of PET-Ag-NPs nanocomposite fibres (P/Ag-NFs) against S. aureus and E. coli bacteria was found to be increased after hydrolysis by 4.5% and 6.5%, respectively. The amount of silver leach-out from the developed antibacterial media was 0.01 ppm for 24 h immersion time, which is in compliance with regulations of National Institute for Occupational Safety and Health (0.01 mg/m 3 ), as well as that of WHO (0.1 ppm). Moreover, the nonwoven was effective in killing up to 94% and 98% S. aureus and E. coli bacteria, respectively. Hence, the developed nonwoven fabric can safely be used for medical and health care textiles, antibacterial clothing and for the development of dry/wet filtration media.